Dental instrument



19, 1939. B. s. QsTRoM DENTAL INSTRUMENT Filed Feb.A 4, 1959 3 aVLEk fINVENTOR.

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' ATTORNEYS.

Patented Dec. 19, 1939 UNITED STATES PATENT OFFICE DENTAL INSTRUMENTBernard S. Ostrom, Cincinnati, Ohio Application February 4, 1939, SerialNo. 254,548

1 Claim.

The present invention relates to dental instruments and is particularlydirected to appliances used in cleaning teeth, finishing the edges of alcavity in a tooth preparatory to lling it, tamping 5 a. lling materialinto a cavity or in numerous other dental operations where verticalreciprocation as distinguished from rotary movement may l beadvantageously utilized.

An object of the invention is to provide an instrument which is capableof translating the rotary driving movement conventionally employed inthe burr-holder of a dental machine into a reciprocating movement, saidmovement being preferably longitudinal of the axis of rotation of thedriving movement.

Another object of the invention is to provide a cushioned reciprocatingmovement to a dental tool actuating head so, that a patient upon whomsaid tool is being used will not noticeably'experience shock orconcussion set up by the tool movement.

A further object of the invention is to provide a dental instrumentwhich is economically constructed, compact, sturdy, and inherentlycapable of producing positive reciprocating movement.

A still further object of the invention is to provide a novel dentalcleaning tool, particularly adapted for usewith my instrument.

Other objects will be apparent from the following speciicaton anddrawing, in which:

Fig. l is an elevational View of a burr-holder with my dental instrumentremovably positioned thereon.

Fig. 2 is an enlarged elevational .view of my 3 dental instrument. ahousing being broken away to show the moving parts thereof.

Fig. 3 is a cross-sectional view taken on line 3-3 of Fig. 2, a meansfor removably fastening the instrument to the burr-holder beingindicated.

40 strument incorporated in a burr-holder attachment having aright-angled bend formed therein.

Fig. 5 is a cross-sectional view taken on line 5-5 of Fig. 4.

The embodiment .of the invention consists of my dental instrument 8removably positioned to the tipA of a burr-holder 9, said burr-holderhaving a grooved wheel I driven by a belt II.y The belt is actuated bymeans of a motor (not shown), the belt being guided by means ofa'universally movable and extensible carriage I2. My dental instrumentis fastened to the burr-holder by means of a conventional deviceoperated by thumb screw I3.

The rotary drive means for my instrument Fig. 4 is an elevational vi wof my dental in- (ol. 's2-26) comprises a shaft I4 removably positionedto the tip I of the burr-holder 9 in the conventional manner. Theinstrument has a sleeve casing IE which encircles the tip of the holderand is held from rotating thereon by means of a slot I1 formed in thesleeve which holder which takes the form of a screw thread I8. rIhelower end of the sleeve is provided with interior threads I9 to receiveexterior rthreads formed in a journal 28. The driven shaft I4 has ashoulder 2I formed thereon which forms a bearing surface for the shaftagainst the journal 20.

A cylinder .cam generally indicated as 22 is mounted coaXially on thelower end of theshaft I4 and comprises a flat grooved disk 23 mountedcentrally on and at an acutel angle to the shaft. The means forfastening the disk to the shaft comprises two cylinders 24 and 25 whichare provided with inclined transverse faces which abut the opposed facesof the disk, the upper cylinder being fastened to the shaft by means ofset screw 26. The lower end of the shaft I4 is threaded to receive a nut21 which rigidly clamps the disk and the lower cylinder 25 against thelower surface of the upper cylinder 24.

The tool head 28 is adapted to be reciprocated by the rotary drivenmeans, the former comprising a lower exposed portion 29 and a substanvtially tubular carriage portion v30. The carriage has two ring members3l and 32 which encircle the cylinder cam 22, said ring members beingjoined byva vertical portion 33, the lower end of the vertical portionbeing connected to the head 28. A cam follower which takes the form of aspring finger 34 is fastened to the upper surface of the ring member 32,means for preventing rotation of the reciprocating head comprising a lug35 extending from the head and -moving in an elongated, vertical slot 36formed in the housing 31. The housing 31 encircles the sleeve casing I5adjacent its upper edge and is rigidly fastened thereto by means of ascrew 38. The lower central portion of the head is preferably providedwith a threaded and vertically disposed aperture 39 to receive athreaded portion of a suitable dental tool 40. I also contemplate theuse of my device in connection with a conventional burrholder 4I whichis provided with a right-angled bend 42 adjacent the end thereof. Theshaft 48, corresponding to shaft I4 in the preferred form, is driven bymeans of a gear 44 meshed with gear 45, the latter being connected tothe rotary drive means by shafts 46 and 41. The head 48 of this deviceis reciprocated in the same manner as the engages a lug on thehereinbefore described device. A tool 49 is threaded to the head andcomprises a shaft 50 connected to a rectangular flat plate 5|, thelatter having a thin layer of cleaning material 52 5 applied to its twosurfaces.

What is claimed is:

A dental instrument for removable attachment on a burr holder comprisinga shaft driven by the holder, a cam positioned on the end of the shaft10 and comprising a at disk mounted centrally on and at an acute angleto the shaft and having an annular groove formed in its periphery anddisposed in a plane parallel to the opposed faces of said disk,cylinders mounted coaxially on the shaft and provided with adjacent andtransversely inclined ends which abut the faces of the disk and meansfor fastening the cylinders to said shaft, a tool head adapted forreciprocation longitudinally of the shaft and comprising an exposed toolengaging portion and a carriage portion, two spaced ring members on thecarriage portion which encircle the cam, a resilient cam followermounted longitudinally on one ring member and having a horizontal springfinger disposed between the ring members and at its outer end engagingthe grooved periphery of the disk, a tubular housing rigidly fastened atone end to the holder and having a longitudinal slot formed therein anda pin on the tool head extending into the slot.

BERNARD S. OSI'ROM.

